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If you're asking just what you need for the physical connection,
Just use a CAT5E or CAT6 cable to connect one directly to the other.

If you're asking the entire process involved,
Presuming that your primary access point, device that will handle DHCP, is the wired router,
You will need to make the wireless router into a secondary access point.

First step is to verify that the wireless router even has the capability to act as a secondary access point
since not all can function as such.
You can check the wireless router manufacturer's website to see if it can function as such.

For some general idea of configuring a wireless router into a secondary access point,
You can take a look at the following tutorial/link,

Since I got a wired router, why can't I just feed one of the LAN jacks of the wired router into the internet jack of the wireless router? The wired router was just P&P and works flawlessly with absolutely no configuration needed.
Then configure the wireless router like that.

Wont the wireless router view it as just a regular modem output ?

None of my computers, etc are networked, they just share the net connection from the router .

If I understood your question correctly,
The issue is that all consumer oriented routers, wireless and wired, by default, enables DHCP.
So in your described scenario,
You would end up with both the wired and wireless routers attempting to send out IPs to your devices.

Originally Posted by Flash

...None of my computers, etc are networked, they just share the net connection from the router .

The very fact that devices are connected to a router, that is an example of a "network".
Networking is where devices share a resource.
Currently, your devices (computers) may not be sharing any files, printers or such with each other
but
Your devices are currently "sharing" an internet connection,
Which is currently facilitated by your "wired" router.

Just checking here, but you do know that most standard wireless routers will have four wired outputs as well as the wireless signal. But if those are not enough, or if you have an access point that has no wired outputs, you can follow Shinma's suggestions to link the routers.

One other suggestion to confuse you. If you ever need to connect two networking devices with a crossover cable, an ethernet cable with two of the wires crossed from the standard alignment, and you need a long cable, you can make a long crossover cable by using a short crossover cable connected to a long standard cable with a female to female connector. Bit of trivia in case you ever need it.